AD9235
SPECIFICATIONS
DC SPECIFICATIONS
AVDD = 3 V, DRVDD = 2.5 V, maximum sample rate, 2 V p-p differential input, 1.0 V internal reference, TMIN to TMAX, unless otherwise noted.
Table 1.
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Test |
AD9235BRU/BCP-20 |
AD9235BRU/BCP-40 |
AD9235BRU/BCP-65 |
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Parameter |
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Temp |
Level |
Min |
Typ |
Max |
Min |
Typ |
Max |
Min |
Typ |
Max |
Unit |
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RESOLUTION |
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Full |
VI |
12 |
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12 |
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12 |
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Bits |
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ACCURACY |
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No Missing Codes Guaranteed |
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Full |
VI |
12 |
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12 |
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12 |
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Bits |
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Offset Error |
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Full |
VI |
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±0.30 |
±1.20 |
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±0.50 |
±1.20 |
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±0.50 |
±1.20 |
% FSR |
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Gain Error1 |
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Full |
VI |
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±0.30 |
±2.40 |
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±0.50 |
±2.50 |
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±0.50 |
±2.60 |
% FSR |
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Differential Nonlinearity (DNL)2 |
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Full |
IV |
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±0.35 |
±0.65 |
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±0.35 |
±0.75 |
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±0.40 |
±0.80 |
LSB |
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25°C |
I |
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±0.35 |
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±0.35 |
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±0.35 |
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LSB |
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Integral Nonlinearity (INL)2 |
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Full |
IV |
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±0.45 |
±0.80 |
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±0.50 |
±0.90 |
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±0.70 |
±1.30 |
LSB |
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25°C |
I |
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±0.40 |
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±0.40 |
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±0.45 |
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LSB |
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TEMPERATURE DRIFT |
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Offset Error |
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Full |
V |
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±2 |
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±2 |
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±3 |
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ppm/°C |
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Gain Error |
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Full |
V |
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±12 |
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±12 |
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±12 |
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ppm/°C |
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INTERNAL VOLTAGE REFERENCE |
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Output Voltage Error (1 V Mode) |
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Full |
VI |
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±5 |
±35 |
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±5 |
±35 |
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±5 |
±35 |
mV |
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Load Regulation @ 1.0 mA |
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Full |
V |
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0.8 |
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0.8 |
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0.8 |
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mV |
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Output Voltage Error (0.5 V Mode) |
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Full |
V |
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±2.5 |
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±2.5 |
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±2.5 |
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mV |
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Load Regulation @ 0.5 mA |
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Full |
V |
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0.1 |
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0.1 |
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0.1 |
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mV |
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INPUT REFERRED NOISE |
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VREF = 0.5 V |
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25°C |
V |
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0.54 |
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0.54 |
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0.54 |
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LSB rms |
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VREF = 1.0 V |
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25°C |
V |
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0.27 |
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0.27 |
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0.27 |
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LSB rms |
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ANALOG INPUT |
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Input Span, VREF = 0.5 V |
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Full |
IV |
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1 |
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1 |
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1 |
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V p-p |
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Input Span, VREF = 1.0 V |
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Full |
IV |
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2 |
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2 |
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2 |
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V p-p |
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Input Capacitance3 |
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Full |
V |
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7 |
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7 |
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7 |
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pF |
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REFERENCE INPUT RESISTANCE |
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Full |
V |
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7 |
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7 |
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7 |
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kΩ |
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POWER SUPPLIES |
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Supply Voltages |
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AVDD |
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Full |
IV |
2.7 |
3.0 |
3.6 |
2.7 |
3.0 |
3.6 |
2.7 |
3.0 |
3.6 |
V |
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DRVDD |
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Full |
IV |
2.25 |
3.0 |
3.6 |
2.25 |
3.0 |
3.6 |
2.25 |
3.0 |
3.6 |
V |
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Supply Current |
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IAVDD2 |
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Full |
V |
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30 |
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55 |
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100 |
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mA |
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IDRVDD2 |
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Full |
V |
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2 |
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5 |
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7 |
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mA |
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PSRR |
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Full |
V |
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±0.01 |
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±0.01 |
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±0.01 |
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% FSR |
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POWER CONSUMPTION |
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DC Input4 |
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Full |
V |
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90 |
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165 |
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300 |
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mW |
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Sine Wave Input2 |
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Full |
VI |
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95 |
110 |
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180 |
205 |
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320 |
350 |
mW |
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Standby Power5 |
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Full |
V |
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1.0 |
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1.0 |
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1.0 |
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mW |
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1 Gain error and gain temperature coefficient are based on the ADC only (with a fixed 1.0 V external reference).
2 Measured at maximum clock rate, fIN = 2.4 MHz, full-scale sine wave, with approximately 5 pF loading on each output bit.
3 Input capacitance refers to the effective capacitance between one differential input pin and AGND. Refer to Figure 5 for the equivalent analog input structure. 4 Measured with dc input at maximum clock rate.
5 Standby power is measured with a dc input, the CLK pin inactive (i.e., set to AVDD or AGND).
Rev. C | Page 3 of 40
AD9235
DIGITAL SPECIFICATIONS
Table 2.
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Test |
AD9235BRU/BCP-20 |
AD9235BRU/BCP-40 |
AD9235BRU/BCP-65 |
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Parameter |
Temp |
Level |
Min |
Typ |
Max |
Min |
Typ |
Max |
Min |
Typ |
Max |
Unit |
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LOGIC INPUTS |
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High Level Input Voltage |
Full |
IV |
2.0 |
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2.0 |
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2.0 |
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V |
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Low Level Input Voltage |
Full |
IV |
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0.8 |
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0.8 |
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0.8 |
V |
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High Level Input Current |
Full |
IV |
–10 |
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+10 |
–10 |
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+10 |
–10 |
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+10 |
µA |
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Low Level Input Current |
Full |
IV |
–10 |
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+10 |
–10 |
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+10 |
–10 |
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+10 |
µA |
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Input Capacitance |
Full |
V |
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2 |
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2 |
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2 |
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pF |
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LOGIC OUTPUTS1 |
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DRVDD = 3.3 V |
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High-Level Output Voltage |
Full |
IV |
3.29 |
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3.29 |
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3.29 |
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V |
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(IOH = 50 µA) |
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High-Level Output Voltage |
Full |
IV |
3.25 |
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3.25 |
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3.25 |
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V |
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(IOH = 0.5 mA) |
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Low-Level Output Voltage |
Full |
IV |
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0.2 |
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0.2 |
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0.2 |
V |
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(IOL = 1.6 mA) |
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Low-Level Output Voltage |
Full |
IV |
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0.05 |
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0.05 |
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0.05 |
V |
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(IOL = 50 µA) |
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DRVDD = 2.5 V |
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High-Level Output Voltage |
Full |
IV |
2.49 |
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2.49 |
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2.49 |
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V |
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(IOH = 50 µA) |
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High-Level Output Voltage |
Full |
IV |
2.45 |
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2.45 |
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2.45 |
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V |
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(IOH = 0.5 mA) |
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Low-Level Output Voltage |
Full |
IV |
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0.2 |
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0.2 |
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0.2 |
V |
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(IOL = 1.6 mA) |
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Low-Level Output Voltage |
Full |
IV |
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0.05 |
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0.05 |
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0.05 |
V |
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(IOL = 50 µA) |
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1 Output voltage levels measured with 5 pF load on each output.
SWITCHING SPECIFICATIONS
Table 3.
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Test |
AD9235BRU/BCP-20 |
AD9235BRU/BCP-40 |
AD9235BRU/BCP-65 |
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Parameter |
Temp |
Level |
Min |
Typ |
Max |
Min |
Typ |
Max |
Min |
Typ |
Max |
Unit |
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CLOCK INPUT PARAMETERS |
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Maximum Conversion Rate |
Full |
VI |
20 |
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40 |
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65 |
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MSPS |
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Minimum Conversion Rate |
Full |
V |
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1 |
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1 |
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1 |
MSPS |
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CLK Period |
Full |
V |
50.0 |
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25.0 |
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15.4 |
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ns |
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CLK Pulse-Width High1 |
Full |
V |
15.0 |
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8.8 |
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6.2 |
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ns |
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CLK Pulse-Width Low1 |
Full |
V |
15.0 |
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8.8 |
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6.2 |
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ns |
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DATA OUTPUT PARAMETERS |
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Output Delay2 (tPD) |
Full |
V |
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3.5 |
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3.5 |
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3.5 |
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ns |
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Pipeline Delay (Latency) |
Full |
V |
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7 |
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7 |
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7 |
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Cycles |
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Aperture Delay (tA) |
Full |
V |
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1.0 |
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1.0 |
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1.0 |
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ns |
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Aperture Uncertainty Jitter (tJ) |
Full |
V |
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0.5 |
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0.5 |
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0.5 |
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ps rms |
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Wake-Up Time3 |
Full |
V |
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3.0 |
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3.0 |
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3.0 |
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ms |
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OUT-OF-RANGE RECOVERY TIME |
Full |
V |
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1 |
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1 |
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2 |
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Cycles |
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1 For the AD9235-65 model only, with duty cycle stabilizer enabled. DCS function not applicable for -20 and -40 models. 2 Output delay is measured from CLK 50% transition to DATA 50% transition, with 5 pF load on each output.
3 Wake-up time is dependent on value of decoupling capacitors; typical values shown with 0.1 µF and 10 µF capacitors on REFT and REFB.
Rev. C | Page 4 of 40
AD9235
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N |
N+1 |
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N+2 |
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N+8 |
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N–1 |
N+3 |
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ANALOG |
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tA |
N+7 |
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INPUT |
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N+4 |
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N+5 |
N+6 |
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CLK |
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DATA |
N–9 N–8 |
N–7 N–6 N–5 N–4 N–3 |
N–2 N–1 |
N |
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OUT |
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tPD = 6.0ns MAX 
2.0ns MIN
02461-002
Figure 2. Timing Diagram
AC SPECIFICATIONS
AVDD = 3 V, DRVDD = 2.5 V, maximum sample rate, 2 V p-p differential input, AIN = –0.5 dBFS, 1.0 V internal reference, TMIN to TMAX, unless otherwise noted.
Table 4.
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AD9235BRU/BCP-20 |
AD9235BRU/BCP-40 |
AD9235BRU/BCP-65 |
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Parameter |
Temp |
Test Level |
Min |
Typ |
Max |
Min |
Typ |
Max |
Min |
Typ |
Max |
Unit |
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SIGNAL-TO-NOISE RATIO |
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fINPUT = 2.4 MHz |
25°C |
V |
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70.8 |
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70.6 |
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70.5 |
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dBc |
fINPUT = 9.7 MHz |
Full |
IV |
70.0 |
70.4 |
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dBc |
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25°C |
I |
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70.6 |
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dBc |
fINPUT = 19.6 MHz |
Full |
IV |
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69.9 |
70.3 |
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dBc |
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25°C |
I |
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70.4 |
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dBc |
fINPUT = 32.5 MHz |
Full |
IV |
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68.7 |
69.7 |
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dBc |
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25°C |
I |
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70.1 |
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dBc |
fINPUT = 100 MHz |
25°C |
V |
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68.7 |
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68.5 |
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68.3 |
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dBc |
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SIGNAL-TO-NOISE RATIO |
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AND DISTORTION |
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fINPUT = 2.4 MHz |
25°C |
V |
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70.6 |
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70.5 |
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70.4 |
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dBc |
fINPUT = 9.7 MHz |
Full |
IV |
69.9 |
70.3 |
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dBc |
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25°C |
I |
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70.5 |
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dBc |
fINPUT = 19.6 MHz |
Full |
IV |
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69.7 |
70.2 |
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dBc |
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25°C |
I |
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70.3 |
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dBc |
fINPUT = 32.5 MHz |
Full |
IV |
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68.3 |
69.5 |
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dBc |
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25°C |
I |
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69.9 |
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dBc |
fINPUT = 100 MHz |
25°C |
V |
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68.6 |
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68.3 |
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67.8 |
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dBc |
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TOTAL HARMONIC DISTORTION |
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fINPUT = 2.4 MHz |
25°C |
V |
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–88.0 |
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–89.0 |
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–87.5 |
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dBc |
fINPUT = 9.7 MHz |
Full |
IV |
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–86.0 |
–79.0 |
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dBc |
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25°C |
I |
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–87.4 |
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dBc |
fINPUT = 19.6 MHz |
Full |
IV |
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–85.5 |
–79.0 |
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dBc |
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25°C |
I |
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–86.0 |
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dBc |
fINPUT = 32.5 MHz |
Full |
IV |
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–81.8 |
–74.0 |
dBc |
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25°C |
I |
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–82.0 |
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dBc |
fINPUT = 100 MHz |
25°C |
V |
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–84.0 |
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–82.5 |
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–78.0 |
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dBc |
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WORST HARMONIC |
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(SECOND OR THIRD) |
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fINPUT = 9.7 MHz |
Full |
IV |
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–90.0 |
–80.0 |
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dBc |
fINPUT = 19.6 MHz |
Full |
IV |
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–90.0 |
–80.0 |
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dBc |
fINPUT = 32.5 MHz |
Full |
IV |
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–83.5 |
–74.0 |
dBc |
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Rev. C | Page 5 of 40
AD9235
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AD9235BRU/BCP-20 |
AD9235BRU/BCP-40 |
AD9235BRU/BCP-65 |
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Parameter |
Temp |
Test Level |
Min |
Typ |
Max |
Min |
Typ |
Max |
Min |
Typ |
Max |
Unit |
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SPURIOUS-FREE DYNAMIC RANGE |
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fINPUT = 2.4 MHz |
25°C |
V |
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92.0 |
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92.0 |
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92.0 |
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dBc |
fINPUT = 9.7 MHz |
Full |
IV |
80.0 |
88.5 |
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dBc |
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25°C |
I |
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91.0 |
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dBc |
fINPUT = 19.6 MHz |
Full |
IV |
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80.0 |
89.0 |
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dBc |
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25°C |
I |
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90.0 |
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dBc |
fINPUT = 32.5 MHz |
Full |
IV |
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74.0 |
83.0 |
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dBc |
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25°C |
I |
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85.0 |
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dBc |
fINPUT = 100 MHz |
25°C |
V |
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84.0 |
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85.0 |
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80.5 |
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dBc |
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Rev. C | Page 6 of 40